Good Morning Alex
Your question is shy on specifics, so I'll cover some broad things that can cause your engine to quit, or run roughly.
A running engine needs three things to arrive smoothly, and in a synchronized way: Fuel, Air, Spark. It also needs something to get it moving at the start, but you said it'll start, so I'll leave that alone.
If fuel isn't arriving like it should. Things to look at are:
If there's no air, most likely you have a dirty / clogged air filter. Google for videos on how to change your air filter, it's usually pretty straightforward. Look at the current filter. if it's really dirty, or clogged with oily gunk, you'll definitely want to put in a new filter, and possibly try to track where oily gunk came from.
if there's no spark, it could be the coil(s) for the plugs being old, dirty, poorly connected to the electrical, or not attached to the plugs properly, it could be that the plugs are mis-gapped, damaged, disconnected, or fouled. Start by looking up the procedure to remove a spark plug on your make/model. Look at the electrode. Is it intact? Does it have the proper gap (you'll need a spark plug gauge). Is it covered in oily residue? (this may mean your piston rings are getting worn and letting oil into the combustion area). There are a lot of other possibilities and diagnoses - you can see more here
Spark Plug Analysis
Your manual will probably have recommended intervals to change out the plugs, it's not a bad idea if you're past that gap since the last change out. eBay is a pretty good place to get reasonably priced new plugs if the cost of the replacements is steep - (in my case, my Prius uses iridium plugs that can retail for $15-20 a piece, or were found on eBay for about $32 for the set of four)
pay attention to the part of the spark plug guide that talks about plugged PCV valves. This is another inexpensive part with a wide range of ease or challenge to replace on different engines. That may make a difference too.
Hoping that this may help!
Good Luck
D
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